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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a39987b8cd0b35bf46dd71060cf7ce4733d94716630dc7f504645d08b9e0b20' 
  AND token = 'zuWNHIm677djljDSiklJuakp+oOkNFBzDx+6zBdIcwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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