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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d3a7dae74dcf305f36c0fbdc3f566092bd06a1270ca8d772c14f16afd113a89' 
  AND token = 'mWMeDwsXj6fBZijSPsuT6eGYZq0IdC/Lrnzlz2819L4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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