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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c991f1b3f8f67ca6768d777790996b1eb0451067dee640dc3d5c4c4ee5152c7' 
  AND token = 'ZdEvQdawscyZWL8XcSqKASqpTMiA8xb41Nf9Bsp8ts4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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