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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86feea83ed581dbb56c5afd28888393ce757168964636adb075b269ea332a0e6' 
  AND token = '8DezKfs+YwFTdvkYsJGC4fDmh0vvUZpca1yxeE64h5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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