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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6eb5a2c4e6a7dffcdd5dadbdd9d0797a610e572eb122f3aed79e03976c59bb09' 
  AND token = 'saMLl32M1xZ8UWViXBK23O/wb/x/nxj0hnxII0AWkOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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