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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52979c24e01c36652a6c9e21fd39becd48202b98d6916679269bc2dc6d7c5cdd' 
  AND token = 'Rk8jcYcln6Lt7nPaGe3APYCmI97L1FMPCqwMDyGAG/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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