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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2e3bec5c31de4005284ddb80bfe1ee09034a3c779db89fe15356617d5f52e1d' 
  AND token = 'fQYAaojM547rWGPQZlpUm9vvoij+Ds08YajxghJP3pQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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