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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c66203b7669ad477007a148b9e755aad7a0c60fed01a33517651c0fd502740e' 
  AND token = '+3LqpaS93q0ULjnLrvK1jBdDfklSPJeQrPhuzwUZxsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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