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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f584d02e691de1fe808ce873d85521bdbc8d7f2ad6ecddeafb6c75470d7d2fd' 
  AND token = 'RPOmPqq79vHD743K1kPhzY4rwD6zvRI6pT37893GvG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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