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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '901de0871c8882496b83767d2ad87113bcdc795678553608adb64e82640daf7e' 
  AND token = '2r2Ux04H5qP0VCBQxogxqxqX5wAdO28XNEx+u6AtvOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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