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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bec8ee6d182a60337881c81ca65251e321c3df4778e7810c759978a24a92c094' 
  AND token = 'A53Souyr3oSVacR1cGZo3BUIlTetrzXG7yzHus0F53s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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