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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bed84da56ef75a1fb273855f9f535121934dfeab4930b616ac3c7b01c5307332' 
  AND token = 'UeI5XsRfywuCsPk2TlaWetUWrfmmWFeQn2bTJNL3Sio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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