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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea663b7dade7c1e593b027573581b961042a0ba7e92253a1c1eaf52d4cae1f33' 
  AND token = 'F9gdEAtNLmSnbbtZvDbSG9X2Z44EHJDZPyTfLVP/iuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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