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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06f215c7189a54772f808b7c8d6fd4ab629aae46b5eace9ea725b8e72e69b00a' 
  AND token = 'rVXXbDDFjRoIz8boRUZjpiiM6uOYOFMYUck6B+pjDCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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