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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcce82503ebc8a64fed324f72f12466939000841039dec87d1ae285f8030c787' 
  AND token = 'w/1OFGRYwkA454/kIq+HfMAzNK5alTcGAvUttEAvVwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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