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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96f11936340371607cfe99de579122219d2dd7ae67a58a7b1d5cfe5026da8d67' 
  AND token = 'xU/n5FASTHwVRLSejO9We+NiKduGAXNr59+3odAo1HY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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