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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c2ac08333c5f0117ec7cb41ff72c965bdc1859908a522195563bf2eef1eccea' 
  AND token = 'BICm83jENksl4MVdNxUPI2jFCR+aAsGoMBcl7Ec1cm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}