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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c9422165341da8b3ce634c8873af6df3dc9fe6aff766a98fb43cf5e459a1b92' 
  AND token = 'AZBS3xQ7oRcVxk/yD/BvTVvMUbsW8nBzIxlv8kgABgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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