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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a1d9d8e40f68aee1f30622d62cca39adcd4f39d172bfd20b63013874480c22e' 
  AND token = 'vx8aGCpPzqpvTB4Ic/7U0X6Z9rvp0KosDtkah0lozYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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