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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4eead19c0842a48d875a8f973c5c73562e9ef8ca5bee07c5bf41c06cc57720d9' 
  AND token = 'JurScpkmfx0+Ixh0hHi7aKcjU8XgsaRtP/BvpByWOcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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