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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01230bd2ba6daaf434c9d7921a843d19c534755c111d25abc12553134077f545' 
  AND token = 'z98qSsjF2iEOQ30B3n4jvWB2wS2kvvDuZ60Xjj/Z/6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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