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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fbe85fabd9389c8dcd640df6f32a443b695f172e2aac2938c176fb381e8327e' 
  AND token = 'O9HLUyjbyPr149Du2s9m5KzcQnhS9AG7GDGNni6D19E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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