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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '968c9b4c1c184a1a11dd5d1e4ad6426ade102a365e3702a7382a6bfde636794c' 
  AND token = 'zf88G7EfIQw1gH4GQdifVRcgZZmfoe/y6mtKmTopzj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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