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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91bb19c939e45ead81bbe1de44fd830a3336d719ddb66bea070285b7193be249' 
  AND token = '+f7XSX9pFKsmTB77rVeIXH5kkwVpuFel8eunnavJN6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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