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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95c1ab3e4bad5bbd3920e120e28cd5f62e3988643693a987a68e63942c44d427' 
  AND token = 'jnPw+F2M4YRmSOSJe5q85loh/17DUYRCw7qaevJwmF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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