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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9dcfc7754c9a2e277484bf9fcce2223ac8135b89563eebf26694e336ffc94bc' 
  AND token = 'zDKXN3rRlQ+Ba6HnuUY1Zsw62qk+kKexLan+E6A9EJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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