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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7103c62d2b0da4a02b86494bc747c85c9b464ff629143cc258de96058cbeee33' 
  AND token = '19RKXiVMiUqoiWuX6cYba/xV5tmnShPwyDdtb2w9cO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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