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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f54a9fcea63561ec2aa5b286fa6b27c5892de461b3975f4f861ec9fd9a38d647' 
  AND token = '0ID1cmsko4QV1CIF/mE5Zb+f15UYV3BJi5ERha4nvzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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