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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca750a38a867e45d288b9230e4661cb16f95654d42d0b68127c09ce7da64d1e0' 
  AND token = '3tSHD4ItY/2usZUkKHjZxDNyK8cyEUokZOwxLHVjhuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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