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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b847451e6eb996509f18ec80aa124179306456038e476c3e0b274ab708bd7ebe' 
  AND token = 'm2p+7ewLGTXsSAJvdQXc9p6yIjfIQ0MaCsMTeALZQ0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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