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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc3b1706a5d0407d5adcb0e280e669b019e3431154e2d03860a99ec60e60bdf1' 
  AND token = 'NedoA9vgdRtNYQSm00Q2ffGbK5sUj/fvz6KItqVj05A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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