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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cc2f6bfaa33020f38d17a7746841c558ee9ca0b94b94bb15dc341955b75b00e' 
  AND token = 'AgdeH0ZX7YtF3AxxVSoeEpUphdd+Xzeznb6TsoNx5k4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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