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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac2b0c694bb8d788978d86946b1bd102d73c834b7eb7276700a075530f37197c' 
  AND token = 'NnjlYHIZQl5sTLvHVucaB0JV7AXZHYPvlB0zqYNHVoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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