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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c3d992a3171a2fd2f1720dc14da50bdfa8e28b32b96650e17c00aef1863a6d9' 
  AND token = '9Z6IEfPvmlr0/7rWep80Azc+EjUJcRI/AfiVl588leE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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