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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd6cc8372560613576c00deeeac88eb0336130ac4761f425271f901a2d87564a' 
  AND token = 'W/ue+6JdfTectYYo3d1/vVEBPcPDaIvmAL2f2cfaTZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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