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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76355c63d1e32629856211c14c81e8eea06e7eb0152d2998bfdd57a66812346d' 
  AND token = '0aI/9G65nynrr7Bu5Y4LOZq4XPgHCgGv9V/05xEGyaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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