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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bea6ef1cc2fcfe1961943eaa20f01359a6d72c4e894e197647ac6c9c44a357f' 
  AND token = '3hEMITnkBawhkizmbDQghAwCruED8Q/GYme1wEPcBX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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