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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4051504ac34e967224c5ec3277ad457266ede02f1bd21f9ac2ef2ac3c762e52c' 
  AND token = '6jRhhnEehgLRowRlWi6RWi5tB2Ui8XXodoAT1hx/GG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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