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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7c66cfe290a6959a027eb38e23de9ec7148b0d521e14263005a39041f42f621' 
  AND token = 'KMNIMtmrirffucVxwflBtRGrTTGB0lrWl2tW9Tf4KVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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