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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8aa6eaf36a4b86402d85e58139d76a8675df406bc980a5cf5d6f8a30fe1ed499' 
  AND token = 'jmCuXR7JqEKlkg8ZdvvBP6JHSvArs+s50rEmMmAYppE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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