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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '010a8f74010c9bcb1f54ff59b42238f17dd15518efe2d24e1604869ca95e30b6' 
  AND token = '1DIwBOfor+9Yx2mCcHCSMsZsPMUQrgGM2u08l208AXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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