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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23397d34ecde47967ba5ce0ac5e8fea8cc341268adeaf8ab84bcc26b8d6e11f8' 
  AND token = 'Vsp2kCdsDtAXzc7f/SeWpHGuW8bpfb8neXQGAd5Mgqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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