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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb0f19c4590c55140a63ea406dc64a33aedbf57b94c897bd77de824d21c2b502' 
  AND token = 'emUCSImv1spzuN+k2VO9k1cJWxe7MUHXA1WukuoMyeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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