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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c6350c0ea441532914571c3eb190dffbb0e0578b576a74861fcb88fcf4d468f' 
  AND token = '0+xb9eF1RkcyN+YMr1h/8dBePhOK01MEAeQlEP4OsGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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