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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e820b28308bdd8095f773fa547ed23546dd8c3bd3b7e18d7207dfebeaba5991' 
  AND token = 'lbFb08kh2PkDTbK9s+dgROt0WWEa0+ibEBSW5mawiXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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