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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '613d121b9f8d550b7e99e702b14ed0918725b964372660f4d62b5f9441d18811' 
  AND token = 'v2/5mJ9sR1FiTYJqbNoCuBlO4hhGaFFi+iT5o7JX81I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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