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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff819c3c8c5d755cbe4a496fb78fee772bf50e66f3566f477f225eccdd1767fe' 
  AND token = 'b3s9TYbbERuy7Kf7SCdcmP98SpqvmP5J9a5GsolnpuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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