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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b470b1409dc5155192c2060195ec27cdc7e4dc6c50bef76ff9efe3324cca739b' 
  AND token = 'ooOKW72ANg1DgouLC3k5Zuc+stui7NG9F5hAmxvR8Yk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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