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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3d2fc8e0ec6d3a60592f8df3d0b6df5bd858245e4dae088051d00b656b3b54a' 
  AND token = 'aMbIkAjZ0zHqWGLBUdmb795N3BFs6VJYsvwhWpJjPtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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