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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a95dfcdab94b0199ae97d9768be75bb732958b18ca967081cc441c7cd1bb447' 
  AND token = 'Qdoly7e7JAsoxoDedSk7fESuK7+jhC7w9/L+uVK1Igk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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