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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cc17d66815bffe034f6b7d63920d3013eabfdb05476fe7e075c28d960a108c2' 
  AND token = 'qcrg3slUUXhuxxgGcGnHk+UFKIB2YM5FIiT5JOcHCdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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