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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2914fd279776b8ebd5f5018a30528391d7969092320bf005521a54936dd69d26' 
  AND token = 'bB47Dak20JEFXiGAMeJk2g3kBgBvfWptYMCO3l9IrPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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