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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad4603256759ee5f8797f8b5986b03acc5c055cbc49f0dad6f9b5eb5c3065e46' 
  AND token = 'RRLPXGYFJdWWg38w2h9HWwB1y9/KfolJMYGwEaOt5eY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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