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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee5041190875816ff3f0eb4d194c6fdc97037dd9b1c450d320827a0829f8760e' 
  AND token = 'GHheDG7wOctrLHBBagyjhjGFD4bxqDDqLOlBe8Grhk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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