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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2af5a9320a2d521067d5b73cdb6a94d014bc1bbefe59927ee7467494823a03f4' 
  AND token = 'Lbc/I9FWoN4bwupxN83xEK7QadGwMFGWpXCKX06L1ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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