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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a82879e085bc8c8e3bfbb0941eb45df76a8c201ee3fef44cc8f6b998449f28c3' 
  AND token = 'msrUtVOMAxJR7z01zLZN1d7ou/Lo+ytF6LB+IUY4UW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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