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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef32236c0b71343e9fc0a337e82c6a48aa6cd900d2a57d8ee3085788efcde39b' 
  AND token = 'swusnLzofG1XYZD/ZIGSKVa8s1brpEoaKRkhmstS8WA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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