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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01adb236aaa255f5f34161c67d3feb8e70103ea0240ad33b44151a87bec4db19' 
  AND token = 'nemshDy95WqsJhGp5kNblFbiNMoj4GWlLWnPwl3QEqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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