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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3bd413f70472b718694062e43102aefaf1199e5ae498987e1b787e161872fe5' 
  AND token = 'MbeQCnri8tsfjDZl2hDsGMVIk8yiQx3v9Ww7qYowWVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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