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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0015668425d0ad8a3ded080aca37bd10777763bcd53205466e9f96e812ad44c2' 
  AND token = 'qwLIhpC1yLgo/LSulDcek+H/azahEtRMdBFG2CY4suU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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