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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ab783784395cc17d69cc5e5b44ab89ebdc443d4ddca943e01249ee170d44e8b' 
  AND token = 'PnSQh4DjgTDT/rrm74J1KejsYLUj2eoh+WoX6X5Jcwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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