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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c94f6230c319409aee0c079d19279bfd673daa3048d1103b3b45c16b911b0d4' 
  AND token = '3nhQEOdJNSs/cI2A4aVU5KCMkNLaVi3nhqIjfdO2OXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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