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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '136bb3b6d4947f0b9367fe094f5b5606f824329c8b2988b24343d4666664a08a' 
  AND token = '55ZwqJ1Ij+Qk09U4RPnNKdX9wRu8wNmjoON3tku60oI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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