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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b9e6e7f2454ff4c1a53f7a73865799ea3ca6be16dfe3d544e2b8174fc2f1a5f' 
  AND token = 'ktNimQptrxq6Ga4Dgr8qxmmjP1u6u/lzLyWgt+Deg/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00080

JSON explain

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