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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86c7f17743864ca76cd8cd944fba6a4ef30be71f02181c40c48db66d4c488df9' 
  AND token = 'I1iB9ezTLffYOh32fzLbP5U84pDYwNuI4SeDhl1o2Uc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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