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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6eadb55756261f719a3b3e6c05e5032c6baa8e2e01946fbd6e54ccd4a6b3a00' 
  AND token = 'A63QMYyHh2Y+9dGPcwRW5IEknRk68QEbkrlOBoGRYh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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